meta-phosphor: settingsd: add BMC template variable

phosphor-settingsd has a variable for creating "host" templates,
which are a handy way of organizing (and generating per host) the
settingsd variables.  Add a similar mechanism for "BMC" templates,
which could also be used for "whole system" settings.  This allows
better organization of the override files.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I435c6d62414874b8e920af8ca346f519e4819a45
diff --git a/meta-phosphor/recipes-phosphor/settings/phosphor-settings-defaults-native.bb b/meta-phosphor/recipes-phosphor/settings/phosphor-settings-defaults-native.bb
index 11271a4..e6a51ac 100644
--- a/meta-phosphor/recipes-phosphor/settings/phosphor-settings-defaults-native.bb
+++ b/meta-phosphor/recipes-phosphor/settings/phosphor-settings-defaults-native.bb
@@ -24,4 +24,8 @@
                 sed "s/{}/${i}/g" ${f} >> ${DEST}/defaults.yaml
             done
         done
+        for f in ${SETTINGS_BMC_TEMPLATES};
+        do
+            cat $f >> ${DEST}/defaults.yaml
+        done
 }